say/do something nice

For one of the latest missions they had, the people from Improve everywhere setup in New York a wooden lectern with a megaphone holster and an attached sign that read, “Say Something Nice”. People passing by had the opportunity to see the message and say something nice. "We wanted to see what would happen if New Yorkers were given the opportunity to amplify their voices to “say something nice.” Here below you can see the video and more details about the project

So by the end of the day or in the morning when you wake up, can you tell if you said or did something nice?